---
title: "Bertazzoni range hood: The filter saturation alarm on a KMC hood"
description: "Bertazzoni range hood: The filter saturation alarm on a KMC hood: bertazzoni range hood — an indicator rather than a code."
url: "https://bertazzonimiami.support/error-codes/signal-filter-alarm-kmc-range-hood/"
date_modified: "2026-08-27"
Appliance type: "Range hoods and ventilation"
---


# Bertazzoni range hood: The filter saturation alarm on a KMC hood

### This is an indicator, not an error code

The third arrangement of the same idea. On these the alarm is cleared from the speed-three key rather than from a dedicated one, and the hood confirms the reset by flashing back at you.

It is on this page because it is what somebody is actually looking at when they go searching. Most of this maker’s equipment publishes no code at all, and an appliance that flashes at you is still telling you something — it simply is not telling you a number.

If you arrived here about **Bertazzoni range hood filter replacement**, this is the alarm that prompts it — and on these hoods the charcoal alarm has to be switched on before it will ever ask.

### What to do

- With the motor and the lights both off, hold the speed-three key for about two seconds. The S1 indicator flashes three times to confirm the reset.
- The charcoal filter alarm is a separate thing that has to be switched on for a hood converted to recirculation: with everything off, hold the intensive key for about two seconds and all four indicators flash twice.
- If your hood ducts outside, the charcoal alarm should be off — otherwise it will keep asking you to replace filters that are not fitted.

### What the repair is

Conditions like this one end at [Range hood ducting & airflow service](https://bertazzonimiami.support/services/range-hood-ducting-and-airflow-service/) more often than anywhere else. The figure on that page is a starting point; the exact cost is confirmed after an on-site diagnostic and agreed in writing before anything is opened.

KMC series hoods

What the machine is telling you

This is an indicator, not an error code

The third arrangement of the same idea. On these the alarm is cleared from the speed-three key rather than from a dedicated one, and the hood confirms the reset by flashing back at you.

It is on this page because it is what somebody is actually looking at when they go searching. Most of this maker’s equipment publishes no code at all, and an appliance that flashes at you is still telling you something — it simply is not telling you a number.

If you arrived here about Bertazzoni range hood filter replacement, this is the alarm that prompts it — and on these hoods the charcoal alarm has to be switched on before it will ever ask.

What to do

With the motor and the lights both off, hold the speed-three key for about two seconds. The S1 indicator flashes three times to confirm the reset.

The charcoal filter alarm is a separate thing that has to be switched on for a hood converted to recirculation: with everything off, hold the intensive key for about two seconds and all four indicators flash twice.

If your hood ducts outside, the charcoal alarm should be off — otherwise it will keep asking you to replace filters that are not fitted.

What the repair is

Conditions like this one end at Range hood ducting & airflow service more often than anywhere else. The figure on that page is a starting point; the exact cost is confirmed after an on-site diagnostic and agreed in writing before anything is opened.

---

**[Read full article: Bertazzoni range hood: The filter saturation alarm on a KMC hood](https://bertazzonimiami.support/error-codes/signal-filter-alarm-kmc-range-hood/)**